Spray gun



1944- w. c. MASON 2,356,865

SPRAY GUN Filed June 6, 1942 Patented Aug. 29, 1944 T'IUNITED STATESPATENT OFFICE SPRAY GUN .William 0. Mason, Slingerlands, N. Y., asslgnorto Amen David Abbott, Albany, N. Y.

ApplicationJune 6, 1942, Serial No. 446,046

4 Claims. (01. 299-140) My invention relates to sprayers andparticularly to spraying devices of the gun type which are adaptedsimultaneously to spray a plurality of different fluids. There are manydifferent fluids, particularly liquids, which when mixed togetherproduce a. desirable effect especially in the coating of certainsurfaces, for example, glass for use as a mirror. The reaction betweensome of these liquids takes place so quickly that it is impracticable tomix them together and then permit any appreciable interval of time toelapse before the mixture is applied to the object. Such mixtures canbest be applied by spraying the ingredients thereof together so that themixing and application to the object takes place practicallysimultaneously. .The separate ingredients of such mixtures andparticularly the mixtures themselves are prone to clog the passages inspraying devices which should be readily accessible for cleaning.

Devices for spraying a plurality of ingredients have heretofore beenproposed in which the ingredients, or at least some of them, areconducted to the nozzle through tubes of rubber or other resilientmaterial and in which the flow through the tubes is shut off bysqueezing of the tubes by separate means cooperating with each tube. Dueto various factors it is not always possible simultaneously to shut offthe flow from all the tubes and, moreover, since the inherent resiliencyof the tubes must be relied upon to eifect a reopening thereof, they donot always satisfactorily function in this way. The usual practice hasbeen to compress the tubes separately against a hard backing with theresult that when the pressure is relieved the tube often does not springback to its normal size. One of the objects of my invention therefore isto provide a device of this character in which resilient tubes are usedto convey the various ingredients to the nozzle but in which these tubesare positioned, one upon the other, within a confined space, so that theflow through all of the tubes may be shut off by compressing themsimultaneously one against the other, thus to build up a substantialthickness of resilient material which is subjected to compression.Another object is to provide a device which can be readily and quicklydisassembled for cleaning. A further object is to provide a gun whichcan be manipulated conveniently and which can be cheaply constructed.

With these and other objectsin view my invention includes the novelelements and the arrangements and combinations thereof described belowand illustrated in the accompanying drawing, in which-- Fig. 1 is a sideelevation view of my gun; Fig. 2 is a side elevation view with half ofthe casing removed;

Fig. 3 is a longitudinal section of the nozzle;

Fig. 4 is a section of the complete gun (both halves of the casing inplace) in about the plane 4-4 of Fig. 2; and

Fig. 5 is a fragmentary section in the plane 5-5 of Fig. 4.

Referring to the drawing, my gun comprises a hollow casing l, preferablyin the form of a pistol, and comprising a handle portion 2 and a barrelportion 3. The casingis formed in two parts, 4 and 5, preferably oflight metal such as cast aluminum, and the half-casings are securedtogether by screws, one of which is shown in dotted outline at 6 in Fig.4, and which pass through holes I and 8 in the half casing 5, as shownin Fig. 2.

The nozzle 9 may comprise an integral brass casting generallycylindrical in form and within which the necessary passages can beprovided simply by drilling. Thus the passage l0, through which themixture is discharged, is formed by merely drilling the nozzle axiallythereof from the front, as shown. The passage for the air or other fluidwhich aspirates the other ingredients into the mixing chamber II andejects the mixture through the passage l0 is'preferably in a straightline with the passage in and is formed by merely drilling the nozzle 9axially from the rear to form the passage l2. The passages and I2 arethen preferably connected by drilling a smaller diameter connectingpassage I 3. Passages l4 and I5 through which two different ingredientsare conducted to the mixing chamber II are formed by merely drilling thenozzle from the rear, as shown, and the mixing chamber is formed bycross-drilling the nozzle so as to form a passage intersecting both theincasing halves between which it is clamped when,

they are secured together, as shown at I9. The discharge end of a metalair pipe 20 and nipples low handle portion, as shown. At the bottom ofthe handle the threaded nipple 22 is sweated or otherwise secured to thepipe 23 and serves as a connecting means for the air line. Rubber tubes23 and 24 have their ends forced over the nipples 2 I, as shown in Fig.2 and extend rearwardly and downwardly through the casing to emergetherefrom at the bottom, as shown at 25. In their passage through thehollow casing the tubes 23 and 24 pass through a restricted space 26formed by the lug or projection 21 on the inside of half casing 4 andthe lug or projection 28 on the half casing 5. Within this space whichis only sufflciently wider than the tubes themselves to permit theirlateral expansion when compressed to closed position, the tube 23 isimmediately above the tube 24 and in contact therewith. Resting upon thetop of the tube 23 is the flat member 7 or cam follower 29 which ispivotally mounted on the pin 30 cast integral with the half casing 5.Cooperating with the member 29 is a cam 3! which is pivotally mounted onthe screw 6 which passes through the hole 8 in the half casing 5. Thecam is provided with an arm 32 which projects outside of the gun, asshown, in a convenient position to be actuated by the thumb or flnger ofthe operator. When pulled downwardly to the position 32', shown by thedotted lines in Fig. l, the cam pushes the follower 29 downwardly andcompresses the tubes against each other to effeet a closure thereof.This cam is so designed that when it is pulled downwardly to theposition 32' it will not return iitself to the tube-open position butmust be moved there manually to relieve the closing pressure on thetubes. The casing casting is provided with an eye 33 thereon whereby thegun may be hung on a nail or hook.

In order to compensate for slight variations in size of the tubes 23 and24, I provide an adjusting means comprising the screw 34 cooperatingwith the plate 35 whereby the depth of the space 26 may be varied. Byturning the screw 34 inwardly the plate 35 may be raised from the lug 28on the half casing 5. In order to prevent displacement of the plate 28the ends thereof are turned down.- wardly and overlie the end of the lug23.

From the foregoing it will be apparent that my gun may be readilydisassembled merely by moving the two screws which hold the casinghalves together whereupon the tubes 23 and 24 may be pulled from thenipples 2| on the nozzle and the screws l6 and I1 removed from the endsof the mixing chamber so that all the passages in the nozzle are readilyaccessible for cleaning. By placing the tubes one on top of the otherand compressing them together and against each other instead ofseparately a resilient cushion of substantial thickness is built upunder the cam follower so that the frequent compression of the tubes isless injurious to the rubber; the compressing means may be of verysimple construction: and the simultaneous opening and closing of thetubes become quite positive.

What I claim is:

1. A spray pistol for simultaneously spraying a plurality of fluidscomprising a handle portion, a barrel portion, a nozzle on said barrelportion, a plurality of resilient tubes within said handle forconducting a plurality of fluids to said nozzle; said tubes at least inone zone in said handle being confined in closely adjacent relation toeach other; a cam for compressing said tubes against each other in saidzone to shut oi! the flow of fluid therethrough, and a lever formanually actuating said cam.

2. A spray gun for simultaneously spraying a plurality of fluidscomprising a nozzle, a plurality of resilient tubes in said gun forconducting a plurality of fluids to said nozzle; said tubes at least inone zone thereof being closely confined in said gun in contiguousrelation to each other, a movable element adjacent one of said tubes insaid zone, and manually actuated means for moving said element forciblyagainst said adjacent tube to compress the same and the other tubes toshut ofl the flow of fluid therethrough.

3. A spray gun for simultaneously spraying a plurality of fluids andcomprising a hollow casing having a hand grip portion and a barrelportion; said casing being divided longitudinally thereof into two partsand screws securing said parts together in assembled relation, a nozzlesecured in the end of said barrel portion by frictional engagement withcontiguous portions of said casing when assembled, a plurality ofresilient tubes in said casing for conducting fluids to said nozzle;said tubes at least in one zone thereof within said casing beingpositioned in confined, side-by-side relation; and manually actuatedmeans for simultaneously compressing said tubes against each other insaid confined zone for shutting oil the flow of fluid therethrough.

4. A spray gun for simultaneously spraying a plurality of fluids andcomprising a hollow casing having a hand grip portion and a barrelportion; said casing being divided longitudinally thereof into two partsand screws securing said parts together in assembled relation, a nozzlesecured in the end of said barrel portion by frictional engagement withcontiguous portions of said casing when assembled, a plurality ofresilient tubes in said casing for conducting fluids to said nozzle;said tubes at least in one zone thereof within said casing beingpositioned in conflned, side-by-side relation; a cam follower adjacentone-of said tubes, and a manually actuated cam cooperating with saidfollower for forcing it against the adjacent tube and said tubes againsteach other to shut off the flow of fluid therethrough.

WILLIAM C. MASON.

